1 cup flour1 cup water1 tablespoon sugar1 teaspoon active dry yeastMix all the ingredients together in a jar or bowl and cover with a clean towel. Let the mixture sit at room temperature for 24 hours, then stir it well. Allow it to sit for another 24 hours, then stir it again. At this point, the starter should be bubbly and have a slightly sour smell.To use the starter, add 1 cup of flour and 1 cup of water to it, stir well, and let it sit for another 24 hours. Repeat this process for 5-7 days, until the starter is very active and bubbly. Then, you can use it in any recipe that calls for sourdough starter.
Put all ingredients in a crock or large jar and let stand in a warm placeuncovered several days.
This is the authors last choice for making astarter, but seems to be in all the cookbooks dealing with SourdoughStarters.
Use only as a last resort.